Offshoreonly.com - 500 efi not making top end power

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)

- - 500 efi not making top end power (https://www.offshoreonly.com/forums/do-yourself-boating-budget/373635-500-efi-not-making-top-end-power.html)

Quote:

Originally Posted by sutphen 30 (Post 4838828)

all my ignition coil jumper have been truck harnesses,secure them up right and as my engines show,,they can go many years(16 now) w/o a problem.as far as ignition modules,ac delco 399's,work well,,I got a base tune w/ jacked up dwell times and burned out modules.I got real good and fast at changing them,even while going over a big azz Pershing wake in hyannis harbors channel.:D

Yep, the higher the rpm, the lower the dwell time needs to be to keep from cooking modules! the gm motorsports mefi4 harness I used to buy when they were a deal of the century comes with that coil connector and it has NO resistor in it like mercruiser does, I think the truck wire does, Ive gotten a few off junk vehicles thru the years. Whats your opinion of the inline resistor?

my guess,its to limit the current to the module,not that I see a need for it nor did gm.

i use a lot of these delco external coil ignitions its often not the modual if its a good modual is almost always the pick up coil you take the dist gear off and take the shaft out and the coil is right there its around 20 bucks try to use a good one as the cheap ones the wire connectors fail .........we use these because they idle with a lot of initial timing and that really smooths out an engine idling for 8-10 hrs everyday